Not to mention there actually has been word on both
Great, I don't know about anyone else but I'm sure going to be able to sleep better at night now.
I love my coop, but the single player experience in L4D is the same shit over and over. Once the whole "it's cool how they rush" novelty thing wears off, you'll find yourself putting the game down pretty quickly.
They could patch crash bugs and exploits until the cows come home for the difference it makes to me. I won't be touching it again until the SDK is released and we start seeing some custom content.
Hype is hugest for a game at it's release. That's when they'd want to have the sdk ready to go. But no, they gotta pop it out a quarter of a year later. What are they doing, waiting until the point at which nobody cares?